With the new valves on Rusto cans, it's hard to get a thin line with any cap, but I've found that overall, these work the best on an adapter with Rusto. You might be able to get a slightly thinner line with a Gold dot, but you're going to go through a sh*tload of caps. I usually outline with euro cans when I'm piecing but if I end up in a situation where I need to use Rusto for an outline or any small details, these are def the best caps for it.